Effect of Embedded Filament Fibers on Mechanical Properties of 3D Printing Cement-Based Materials

3D printing technology has special printing process, could not print both cement-based materials and steel bars in practical engineering, affects the mechanical properties of concrete. In order to solve the problem, three kinds of embedded filament fibers (Basalt filament fiber, Glass filament fiber, and Polyethylene filament fiber) are selected to add into the cement mortar to improve the bond and hardness strength of ITZ, which could be characterized by compressive test, flexural text, and bond strength test, and study the influence rule of different embedded filament fiber on the mechanical properties of 3D printing mortar by scanning electron microscope (SEM). The results show that all of the three kinds of embedded filament fibers can significantly improve the compressive strength, flexural strength, and interlayer bond strength of the 3D printed mortar, and the three kinds of fibers can have good bond with cement mortar. The Polyethylene fiber is the best, improving the flexural strength, compressive strength, and interlayer bond strength of the printed mortar by 36.4%, 29.9%, and 36.1%, respectively.